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Q61. What is the value of the summation Σk=1n-1 k?

Mathematics — NUST Mock By Dogers 5 — Question 61 of 200

A. n(n+1)/2
B. (n+1)(n+2)/2
C. n(n-1)/2
D. (n-1)(n-2)/2

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What is the value of the summation Σk=1n-1 k? | Mathematics MCQ #61 | Examora | Examora